I listened to a psychologist say that the “relationships are hard work argument” is dumb. Life is already hard and relationships should make your life easier. He argues that couples should try and have fun with each other as much as possible. You laughing at your wife playfully makes her life easier. It makes the terrible things, like dealing with the government, more tolerable. But I think the other part of it is that you’re a genuinely happy person. It’s hard to laugh when you’re numb or depressed. So you’ve found things to be hopeful about and you choose to laugh instead.